i don''t believe any of Adobe's products would be found on a Yum
repository.
Adobe's Reader is here,
http://www.adobe.com/support/downloads/product.jsp?product=10&platform=unix
<http://www.adobe.com/support/downloads/product.jsp?product=10&platform=unix>

there's also a variety of opensource/thirdparty PDF viewers, including
evince, kpdf, xpdf, etc.  Evince is the standard document viewer in
Gnome, and is in the base repo for centos 5

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